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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67d66c758f19d01f748385828a2b75eb6e78fd7ebed9baaa3f27fbcb54d98f5' 
  AND token = 'coJI8qARAXNOqqaZLS4lY/rKw99gpVnLCm/Aa8sOMkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}